213388361 has 4 divisors (see below), whose sum is σ = 219155652. Its totient is φ = 207621072.

The previous prime is 213388349. The next prime is 213388363. The reversal of 213388361 is 163883312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200392336 + 12996025 = 14156^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 213388361 - 2¹⁰ = 213387337 is a prime.

It is a super-2 number, since 2×213388361² = 91069185220532642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213388363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883590 + ... + 2883663.

It is an arithmetic number, because the mean of its divisors is an integer number (54788913).

Almost surely, 2^213388361 is an apocalyptic number.

It is an amenable number.

213388361 is a deficient number, since it is larger than the sum of its proper divisors (5767291).

213388361 is an equidigital number, since it uses as much as digits as its factorization.

213388361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5767290.

The product of its digits is 20736, while the sum is 35.

The square root of 213388361 is about 14607.8184887409. The cubic root of 213388361 is about 597.5720037173.

The spelling of 213388361 in words is "two hundred thirteen million, three hundred eighty-eight thousand, three hundred sixty-one".